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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b033088a125387f99fa773a48f0fc497797b48a2f52e48554ead476c3cc76b' 
  AND token = 'cmz3FhEKdZt8XyPCfFDD+MeeOT6t9WvKjY6AeNId780=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}